Revert "bug symfony#25789 Enableable ArrayNodeDefinition is disabled for empty configuration (kejwmen)"

This reverts commit 132cec4, reversing
changes made to d411301.

Author: fabpot

src/Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php

@@ -226,9 +226,7 @@ public function canBeEnabled()
             ->beforeNormalization()
                 ->ifArray()
                 ->then(function ($v) {
-                    if (!isset($v['enabled'])) {
-                        $v['enabled'] = !empty($v);
-                    }
+                    $v['enabled'] = isset($v['enabled']) ? $v['enabled'] : true;
 
                     return $v;
                 })

src/Symfony/Component/Config/Tests/Definition/Builder/ArrayNodeDefinitionTest.php

@@ -207,20 +207,6 @@ public function testCanBeDisabled()
         $this->assertTrue($this->getField($enabledNode, 'defaultValue'));
     }
 
-    public function testEnableableNodeIsDisabledForEmptyConfigurationWhenNormalized()
-    {
-        $config = array();
-
-        $node = new ArrayNodeDefinition('root');
-        $node->canBeEnabled();
-
-        $this->assertEquals(
-            array('enabled' => false),
-            $node->getNode()->normalize($config),
-            'An enableable node is disabled by default'
-        );
-    }
-
     public function testIgnoreExtraKeys()
     {
         $node = new ArrayNodeDefinition('root');
@@ -254,7 +240,6 @@ public function getEnableableNodeFixtures()
             array(array('enabled' => true, 'foo' => 'baz'), array(array('foo' => 'baz')), 'any configuration enables an enableable node'),
             array(array('enabled' => false, 'foo' => 'baz'), array(array('foo' => 'baz', 'enabled' => false)), 'An enableable node can be disabled'),
             array(array('enabled' => false, 'foo' => 'bar'), array(false), 'false disables an enableable node'),
-            array(array('enabled' => false, 'foo' => 'bar'), array(), 'enableable node is disabled by default'),
         );
     }
 

src/Symfony/Component/Config/Tests/Definition/Builder/TreeBuilderTest.php

@@ -12,7 +12,6 @@
 namespace Symfony\Component\Config\Tests\Definition\Builder;
 
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Config\Definition\Processor;
 use Symfony\Component\Config\Tests\Fixtures\Builder\NodeBuilder as CustomNodeBuilder;
 use Symfony\Component\Config\Definition\Builder\TreeBuilder;
 
@@ -132,22 +131,4 @@ public function testDefinitionExampleGetsTransferredToNode()
         $this->assertInternalType('array', $tree->getExample());
         $this->assertEquals('example', $children['child']->getExample());
     }
-
-    public function testRootNodeThatCanBeEnabledIsDisabledByDefault()
-    {
-        $builder = new TreeBuilder();
-
-        $builder->root('test')
-            ->canBeEnabled();
-
-        $tree = $builder->buildTree();
-        $children = $tree->getChildren();
-
-        $this->assertFalse($children['enabled']->getDefaultValue());
-
-        $processor = new Processor();
-        $result = $processor->process($tree, array());
-
-        $this->assertEquals(array('enabled' => false), $result);
-    }
 }